Rodinal

Patrick Gainer wrote:
A little off topic, but did you fellows hear about the joker who almost
got some city council to ban the use of paper cups containing dihydrogen
monoxide? It was described as a colorless, tasteless, odorless liquid
that could be fatal if inhaled.

Yeah, it was a school project that was to test gullibility. :-)

Patrick Gainer wrote:

jjs wrote:

In article , wrote:

Someone sugested using the medicine measuring syringes that look like a
hypodermic and come with a soft plastic stopper with a hole in it. I
trim one of these till only one ring protrudes from the bottle and drill
a hole in the bottle's screw cap to let the nozzle come through, then
screw the cap on permanently. I leave the syringe in the stopper between
times as a seal. This is convenient.

Can't picture it, but there are plastic 'accordian' shapped syringes
intended specifically for chemicals. They aren't stoppers. They let oxygen
into the bottle. Beware if that's what you are using.

Not to brag or anything but my developer stock solutions are not
affected by oxygen. I've not seen any evidence except color change that
Rodinal is either. I'm sloppy enough to have seen it, I assure you.
I should have specified currently concocted stock solutions, the ones
with no water.

On 24 Mar 2004 14:30:57 -0800, (Dan Quinn) wrote:

Unless that is, the public
formula is seven times the strength.

I believe the original formula was published around 1905

Water @ 125F 750ml
p-Aminophenol Hydrochloride 100g
Pot. metabisulfite 300g
Water to make 1.0L

50% Hydroxide Solution
Water @ 65F 75ml
Sod. Hydroxide 50
Water to make 100ml

From my site of course ;)

Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

On 24 Mar 2004 23:27:54 -0800, (Dan Quinn) wrote:

Public domain "Rodinal" is NOT even close to Agfa's Rodinal. Dan

I would say that it is close but not identical. As Michael
noted, the distributed version is very basic which indicates that it
may have less bisulfite in it.


Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

On Wed, 24 Mar 2004 09:08:12 -0600, (jjs)
wrote:

Thanks for that, and your other post, Dan. I had an awful time finding
small glass bottles. Even the pharamcists quit using them. So I ordered
from Boston Round and by your post it appears that I guessed well.

Why not just use the 250~300 ml plastic cough syrup bottles
that any pharmacy has ? I believe that most are made of PET which is
an excellent storage medium.


Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

On Thu, 25 Mar 2004 02:50:52 -0600, (jjs)
wrote:

Recycled may have been a better word. Recycled will likely contain
more impurities. [...]

I'll never drink Heinekin again.

They just add to the flavor ;)


Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

Besides, the MSDS cites pot. bromide, not in the public formula.
But this could have been one of those small changes - more alkali, put
some bromide to avoid fog.

Jorge

John wrote in
:

On 24 Mar 2004 23:27:54 -0800, (Dan Quinn) wrote:

Public domain "Rodinal" is NOT even close to Agfa's Rodinal. Dan

I would say that it is close but not identical. As Michael
noted, the distributed version is very basic which indicates that it
may have less bisulfite in it.


Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

In article , John
wrote:

On Thu, 25 Mar 2004 02:50:52 -0600, (jjs)
wrote:

Recycled may have been a better word. Recycled will likely contain
more impurities. [...]

I'll never drink Heinekin again.

They just add to the flavor ;)

You are the man to ask: Have you noticed that Rodinal concentrate looks
just like Guinness? Did you discover it the hard way?

On Thu, 25 Mar 2004 19:05:57 -0600, (jjs)
wrote:

You are the man to ask: Have you noticed that Rodinal concentrate looks
just like Guinness? Did you discover it the hard way?

Ummmm, now that we have children, I tend towards something a
little more caffeinated. To all of those that warned to get some
sleep, YOU WERE SO RIGHT !!

And yes, Rodinal does remind me of coffee ;)


Regards,

John S. Douglas, Photographer - http://www.darkroompro.com
Please remove the "_" when replying via email

John wrote


I believe the original formula was published around 1905

Water @ 125F 750ml
p-Aminophenol Hydrochloride 100g
Pot. metabisulfite 300g
Water to make 1.0L

50% Hydroxide Solution
Water @ 65F 75ml
Sod. Hydroxide 50
Water to make 100ml

From my site of course ;)

Nice site but where are the galleries?

One other formula of a Rodinal type has been posted this thread.
Perhaps you saw it: 20gr p-AM, 60gr metabisufite, and 28gr KOH per
400ml. A complete discription of it's compounding is included.
Contrast that mix with Formulary's 50gr, 150gr, and 215gr per
1000ml. On a liter basis the above posted formula has 70gr of KOH.
Where does the Formulary and Jacks Pic come up with 215gr? Am I
over-looking something somewhere? I've not done the arithmatic
yet but would not be surprised if the 70gr gives the 3% KOH
Agfa claims on their bottle. Dan